THE MUSCLES OF THE FOOT. 



663 



A small muscular slip has occasionally been observed passing from the long plantar liga- 

 ment to the lateral surface of the base of the first phalanx of the second toe. It appears to 

 represent an adductor secundi digiti. 



Fig. 629. 



Os calcis, inner tubercle ^ 



Flexor brevis digitorum 



Flexor longus hallucis tendon 



Flexor longus digitorum tendon 

 Flexor accessorius, inner head 



Tibialis posticus tendon 



Abductor hallucis, cut 



Flexor brevis hallucis 



First plantar interosseus 



Adductor hallucis, oblique portion 



Tendon of flexor longus 



digitorum 

 Tendon of flexor brevis 



digitorum 



Flexor longus hallucis tendon 



Os calcis, outer tubercle 



Abductor minimi digiti 



— Flexor accessorius, outer head 

 — I'eroneus longus tendon 



Long plantar ligament 



Abductor ossis metatarsi quinti 

 (part of abductor minimi digiti) 



Tendon of peroneus longus 

 in sheath 



Flexor brevis minimi digiti 



ff\^^^~'^'^'^"*^'°'^ minimi digiti 



•*' ^'■ ■. % — Adductor hallucis, 

 / transverse portion 



\ 



Deep dissection of sole of right foot, showing short flexors 

 of great and little toes and adductor muscles. 



{dd) The Muscles of the Fourth and Fifth Layers. 



I. Interossei plantares. 2. Interossei dorsales. 



3. Flexor brevis minimi digiti. 



As in the hand, the fourth and fifth layers of the pre-axial musculature become 

 united to form the dorsal interossei, portions of the fourth layer remaining distinct to 

 form the piatitar interossei. The arrangements in the hand and foot differ, however, 

 in this respect, that in the foot the lateral muscle derived from the fourth layer forms 

 a large, well-developed structure termed the flexor brevis minimi digiti. 



I 



I. Interossei Plantares (Fig. 630). 



Attachments. — The plantar interossei are four spindle-shaped muscles. The 

 first is very much stronger than the others, and is often described as the outer head 

 of the flexor brevis hallucis (page 661). It arises, in common with the flexor brevis 



